View Compilation Error

0_0_33528091_18538.c: In function 'main':
0_0_33528091_18538.c:34:15: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     inv[0]=1; for(int i=1;i<=100000;i++) inv[i]=inv[i]*inv[i-1]%mod;
               ^
0_0_33528091_18538.c:34:15: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code